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Is solar really the most effective renewable on an overcast, post hurricane day? Perhaps the (bio)diesel used to power the truck could be more efficiently used by a generator. Are portable wind turbine trucks a thing?

Depends on how thick the clouds are. You still get energy. If they're ready-to-rain clouds, yeah, you're probably getting 10% of peak. If they're white, fluffy just-passing-through clouds you'll be running somewhere between 60-75% of peak.

Still better than nothing, especially since the truck will be stationary and not running, so any fuel it uses is just to get it there and not to run any sort of distribution system.

Also, from what I understand, their efficiency is largely a factor of location (ground level in the middle of a huge city being pretty close to the worst possible option) and size. Making them small and mobile would be incredibly counter-productive. Solar is just about the only green energy source that doesn't lose efficiency when scaled down in size. You get pretty much the same power per square foot from a couple small, modular panels as you can with a giant array. Most other forms of power generation (including wind) are far, far less efficient on a small scale.